Question

The compound that is not a constituent of the electrolytic mixture used in Hall-Heroult's process is ______.

विकल्प

• \[\ce{Al2O3}\]

• \[\ce{NaAlO2}\]

• \[\ce{Na3AlF6}\]

• \[\ce{CaF2}\]

Answer 1

The compound that is not a constituent of the electrolytic mixture used in Hall-Heroult's process is \[\underline{\ce{NaAlO2}}\].

Explanation:

Aluminum from aluminum oxide is extracted using the Hall-Heroult technique (alumina, \[\ce{Al2O3}\]). In order to lower the melting point of alumina and increase the conductivity of the solution, an electrolytic mixture made primarily of molten alumina, a mixture of cryolite \[\ce{(Na3AlF6}\]), and additional fluxes such as calcium fluoride (\[\ce{CaF2}\]) is employed in this process.